1. Survey the center line and side shots for the two intersecting p-lines ("main" and
"spur").
Survey/Map module
2. Enter the data into Survey/Map traverses and join them together at the junction.
Location module
3. Use Location Design to design the road that will be built first (main).
4. Export the built road from Location to DXF using the File-Save As... menu item
(select Autocad Format (*.DXF) from the "Save File as Type:" list). Be sure to include
only designed layers:
REDGE
SLPSTAKE
DSNSECT1
DSNSECT2
5 Also use a reasonable "Section Extension".
Terrain module
6 File Import... the DXF file created above make sure the import options include "3D"
points).
7 Import the spur traverse into the same terrain. Include side slopes with a reasonable
"Final Slope Horizontal Distance".
8 Select spur center line as current feature, use menu item Edit-Modify Current
Feature-Properties/Append...to turn off center line Elevations.
9 Delete, from the terrain, any spur cross section points that conflict with the main built
road data.
10 Use Edit-Calculate Terrain Model... to generate a model. This model will represent
the terrain after main is built but before spur is built.
11 File-Export... the spur feature to traverse format (make sure the side slopes are
included with a reasonable extension and rename it to spur2). This feature has the
same planometric shape as spur but the elevations and side shots are extracted from
the model. (It is a "draped" feature, because of step 8).
Location module
13 Create a new design based on the exported spur2 traverse. The junction area will
show the existing main built road in the cross sections, and volumes will be calculated
accordingly.
